I've recently purchased a 2020 Silverado and I have an electronics compartment on order that sits under the back seat. My radio will be installed in the electronics compartment. Has anyone run large gauge battery cable from the engine bay to the back seat? I had a 2016 RAM and there were floor drain plugs/grommets under the back seat that I was able to use but I haven't located any in this truck. Does anyone have any other suggestions for running 4 AWG cable from the engine bay to the back seat?